Sheet-paper cutter



May 20, 1930.

c. s. CHESS MAN SHEET PAPER CUTTER Filed Aug. 29.

Patented May 20, 1930 UNITED STATES PATENT oFr lcl-zf GEDRIG S., CHESSMAN, OF PITTSBURGH, PENNSYLVANIA, ASSIGNOR 0F TWO-THIRDS T0 ARTHUR J. DAVIS .AND CHARLES D. DAVIS, BOTH OF PITTSBURGH, PENNSYL- VANIA SHEET-PAPER CUTTER Application filed August 29, 1928. Serial No. 302,761.

My invention relates to'a sheet paper cutter, 1

and important objects thereof are to provide a paper cutter of the character described which is electro-magnetically operated, which is controlled by the movementof the paper being-cut, which will facilitate and expedite the cutting operation with a minimum of attention, which will automatically suspend operation when the paper accidentally becomes misaligned and which will positively and accurately cut the sheets in exact predetermined lengths.

Further objects of theinvention are to provide a device of the class stated which. is simple in its construction and arrangement, durable and eflicient'in its. use, and comparatively inexpensive to manufacture, install, operate and maintainpi With the foregoing'and other objects 'in view which will appear as the description. proceeds, the invention resides in the com-- bination and arrangement of parts and in the details of construction hereinafter referred" to, it being understood that changes in the precise embodiment of the invention herein-' after disclosed can be made within the scope of what is claimed without departing from the spirit ofthe invention;

In the drawing wherein like numerals of reference designate corresponding parts throughout the several views Figure 1 is aside elevational view of asheet paper cutter constructed 1n accordance with the invention.

Figures 2 and 3 are, respectively,top plan and front views thereof.

Figure-4 is adiagrammatic view; of the wiringarrangement involved inthe operaroll 4 is disposed above and parallel to the roll 5. The latter is provided with afixed driving pulley 5 adapted for connection with the motive power for operating the feed rolls 4 and 5 to move the paper forwardly onthe table top 2. It'will, of course, be obvious that the rolls land 5 maybe arranged and driven in any. other suitable manner, or that the paper 3 may be fed forwardly by any other suitable means.

- Thefeatu're-of the present invention resides in the sheet cutting element, which is positioned at the forward end of the supporting table 1. The cutting device includes a cross bar 6, which extends transversely across the forward end of the supporting table 1. The cross-bar 6 is carried by a pair of slide rods? which are connected to respective ends thereof, and slidably depend through respective 'slide' bearings 8. The latter are fixed torespective sides of the supporting table 1 at the upper end of the latter.

Each of the 811018 rods 7 is formed it its lower end withan armature head 9, and an associated solenoid 10 is mounted at each side 'ofthe supporting table 1 directly below and in vertical alignment with respective armature heads 9. a

'A transversely disposed, stationary blade 11 is secured'to the forward-end of the table top 2', by means of countersunk screws 12.

' Thestationary blade 11 has its upper or cut- I ting edge disposed on an even plane withthe table top 2. 'Atransversely extending shearing blade 13 extends through a corresponding slotl l formed in the'cross'arm 6. The shear-.

ing blade 13 is'vertically adjustable inthe slot 14 and is secured in the adjusted position in the cross-arm 6 by set screws 15; The shearing blade 13 has an angularly disposed lower or cutting edge 16 and operates against the outer or forward "side of the stationary blade 11 during the cutting operation. The angular edge 16'of the blade'13 provides a shearing action for more effectively accomplishing the paper cutting operation. v

A coil spring 17 is mounted on-each of the slide rods 7 between the cross -bar'6 and respective slide bearings 8. The normal action 7 I vated and inoperative position, as clearly shown in the drawing.

It will here'be noted that my improved sheet paper cutter is primarily intended for cutting paper thathasalready been printed,

as for instance, wrappers for commodities.

7 This makes it essential thatrthe' paper be severed at the right point; so that the printed ,matter be complete on each length. of paper 10 j when cut 'fromthe roll. When printing the paper the marginal'edge's thereof are formed with perforations 18, which are regularly spaced and arranged in pairs, that is, a per foration at the marginal edge-of one side of 151 the paper is horizontally aligned with a similar perforation at the marginal edge'of the or other sideof the paper.

pair of resilient contact arms 19am adjustably mounted in a horizontally disposed slot 20 which is formed in the table top 2 forwardly of the feed rolls and 5. Each of the contact arms 19 is substantially L'- sha-ped and carries a 'rotatably' mounted contact wheel21 at its forward end. Thelaterally' Y disposed portions of the contact arms 19, are t disposed outwardly and are mounted on in-- csulating blocks 22 to insul'at'e the contact I arms 19 from thesupportin'g table1.

The contact arms1-9-with flSSOCliLfBd in i sulating blocks22aremaintainedin position by means of securing screws 23: 'When in the adjustedposition, the insulating blocks 22 are disposed at respective sideedges'of the paper 3 and serve as'a guide for the latter as i well asan' insulating support forthe contact arms 19. The contact wheels 2l'travel ontop .jof the paper 3 in the path oftravel of the perforations 18 at respective: edgemargins of thepaper 3. v s

A transversely disposed contact bar 24 is The embedded in an insulating bar 25.

latter is in turn embedded in the *table. top

'2 to dispose the top of 'thecontact bar 24; on an even plane with thetable'top 2. The contact bar 24 is positioned directly beneath the vcontact wheels 21, and the latter normally have contacting engagement therewith. Th'e arrangementof the contact arms 19 with a associated wheels 21 not 7 only -provides con- -tacting engagement to effect' thecutting op-'- eration, as hereinafterdescribed, but'rfurther serve to maintain the paper; 3 fiatlyuponithe table top 2 during its travel along the latter ;.When the contact-wheels '21 contact with the contact bar24through apair of horizon- 1 tally aligned perforationsyl8 in the paper 3,

the solenoids10' willkbe energized, whereby.

; the cross-bar 6 and associated shearing blade 13 will'be drawnidownwa-rdly against the r 0 actions of the springs 17, and effectthe paper fcutting operation. As soon as 'theengage'd pair of perforations 18 have passed from under the contactwheels 21,'the "paper 3 will insulate'the latter from the contact bar 24 '65jthereby' causing the'decnergization of the contact arms 19. The other contact armf19" connects with the positive main conductor solenoids 10 and permittingthe return or cle j vation of the shearing blade 13 by the action f r I of'the springs 17 7 The wiring'arrangement for operating the cutting device herein described is clearly illustrated in Figure 4." The negative termi na'ls 26"are joined to the negative main conductor 27, while the positive terminals 29 of the solenoids '10. are joined with one of the 30through the control switch 31. r In the operation of my improved sheet cutter the paper 3 travels continuously forward, along the table top 2, by the operation of theifeed rolls 4: and 5. Every timethe con- 7 tact wheels 21 contactwith thecontact bar 24: through a pair of aligned perforations 18 in the travelling paper '3, the-solenoids 10 will be energized to eflt'ect the cutting operation. It will be noted that both of'the contact wheels 21 must contact simultaneously with the contact bar 24to close theoperating .circuit. In the event that thepaper3 is not" properly aligned, upon the table top-'2', where by one of the associated pair of perforations v 18, of the paper, is'disposed inadvance tithe" other, the-device will not function to'e'fiec the cutting operation until the proper-align:-

ment of the paper-is established. f

plane of the top of said table, a pair of slide 1 2 rods slidably mounted for vertical movement at respective sides :of said table, an armature head carried at the lower end of 7 each of said slide rods, a cross-bar having its ends fixed to'the upper ends of said slide rode, a shearing blade associated'wit-hsaid sta-' tionary blade and being adj ustably connected in said cross-bar, a spring carried by ach-"of, said slide rods for normally maintaining said shearing blade in the elevated position, a

pair of solenoids supported by said table and associated with respective armature heads, an a i operating circuit for energizing said solenoids, a pair of resilient contact arms adjust- 5 ably mounted on said table and engaging re- 7 spective side edge margins of thepaper, said i 7 contact arms connecting with said operating circuit and'being adapted for contacting with aid contact bar through apertures provided 3-130 in the paper for closing the operating circuit to energize said solenoids for eflfecting the cutting operation, and means for feeding the paper forwardly through said stationary and shearing blades.

In testimony whereof I aflix my signature.

CEDRIC s. CHESSMAN. 

